LICA I Mid Question Paper
LICA I Mid Question Paper
LICA I Mid Question Paper
2. (a) Write Ideal Characteristics of an op-amp? The CMRR of an op-amp is 10000. Two sets
of signals are applied to it. First set is V1 = +20 V and V2 = 20 V and the second set is
V1= 540 V and V2 = 500 V. Calculate the percentage difference in output voltage for the
two sets of signal. (5M)
(b) Briefly explain why negative feedback is desirable in amplifier applications and derive
the output voltage expression for ideal inverting amplifier (5M)
3. (a) draw the equivalent circuit of an op-amp and discuss about Op-amp stability? (5M)
(b) Define slew rate and derive the expression for it. List the causes of slew rate. (5M)
4. (a) Explain ideal differentiator circuit and obtain output voltage expression? (5M)
(b) Deign an practical differentiator circuit with input signal frequency 5 kHz? Assume
necessary parameters? (5M)
5. (a) Draw the schematic of 3 Op-amp Instrumentation amplifier and derive output voltage
expression?(5M)
(b)Draw the circuit of three input inverting type summing amplifier and derive the
expression for output voltage. (5M)
In differential amplifier the output is taken between two collectors the it is called
a) Unbalanced output b)Balanced output c) single input d) None of the above
The circuit in which the output current is forced equal to the input current is called as
a) Constant Current Bias method b) cascading of differential amplifiers c) current mirror circuit d) All of the above
a) 53db
b)96db c)20db
d)47db
The two input signals are different from each other then the differential amplifier is worked in__________________
a) Common Mode b) Differential Mode c) Multiplication Mode d) None of these
The average value of the two currents flowing into the op-amp input terminals is called
a) Input bias current b) Input offset current c) Input offset voltage d) output offset voltage
10
Most of the linear ICs are based on the two transistor differential amplifier because of its
(a) input voltage dependent linear transfer characteristic(b)high voltage gain
(c) high input resistance (d)high CMRR
11
a)
Rf
R1
b)
Rf
1
R1
c)1 d) 0
a) V0
Vin b) V0 Vin
c) V0
Vin
d) V0
Vin
14
15
16
17
18
19
If the differential and common mode gains of differential amplifier are 50 and 0.2,then the C MRR will be
(a)10
(b) 49.8 (c) 50.2 (d) 250
20
The voltage that appears at the output of an op-amp even when the differential input voltage is zero
(a)input offset voltage (b)output offset voltage (c)both (d)none